Exact numbers
Integers are written digit for digit, even beyond 2^53, and floats keep their written precision. A warning reminds you that many JSON parsers will round very large integers.
What is reported
Blockers: values JSON cannot represent at all (.inf, .nan, complex keys, keys that collide after conversion). Consent-required: data that changes type or disappears (comments, custom tags, timestamps, binary). Information: aliases expanded, merge keys applied, multiple documents wrapped in an array. Recursive aliases cannot be expanded and stop the conversion.
Questions
- Are merge keys (<<) applied?
- Only when you enable merge keys in the profile. Then explicit keys win over merged ones, as the merge-key specification describes; otherwise << stays an ordinary key.
- What happens with multiple documents?
- They become a JSON array, or you can convert only the first document. Either choice is reported.